title: Orthodontic treatment combined with mandibular distraction osteogenesis and changes in stomatognathic function.
abstract: We performed an orthodontic treatment combined with mandibular distraction osteogenesis in a 15-year-old patient who wanted a correction of a chin deficiency and a protruding upper lip. The patient had an Angle Class II division 1 malocclusion with mandibular retrusion, a low mandibular plane angle, and scissors bite. First, a quad-helix appliance was applied to the mandibular dentition to correct the scissors bite in the bilateral premolar region. Later, a preadjusted edgewise appliance was applied to the maxillary and mandibular teeth. After 3 days, a mandibular distraction osteogenesis was performed. During and after the distraction, the open bite between the upper and lower dental arches was corrected using up and down elastics. The total treatment time with the edgewise appliance was 14 months. A skeletal Class I apical base relationship, good facial profile, and optimum intercuspation of the teeth were achieved with the treatment. The jaw-movement pattern on the frontal view did not change during gum chewing. However, the maximum gap without pain increased. The electromyographic (EMG) activity of the masseter and anterior temporalis muscles, and maximum occlusal force increased. The present case report suggests that an orthodontic treatment combined with mandibular distraction osteogenesis in a patient with mandibular retrusion in the late growth period might be effective for improving stomatognathic function.
authors.affiliation: Field of Developmental Medicine, Health Research Course, Department of Orthodontics, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan.
authors.forename: Aya
authors.initials: A
authors.lastname: Maeda
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Soejima
authors.forename: Mikinori
authors.initials: M
authors.lastname: Ogura
authors.forename: Haruhito
authors.initials: H
authors.lastname: Ohmure
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Sugihara
authors.forename: Shouichi
authors.initials: S
authors.lastname: Miyawaki
mesh_terms: D000293:Adolescent; D001732:Bite Force; D002680:Chin / Q000601:surgery; D003131:Combined Modality Therapy; D004576:Electromyography; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000601:surgery / Q000628:therapy*; D008334:Mandible / Q000601:surgery*; D008406:Masseter Muscle / Q000503:physiopathology; D008409:Mastication / Q000502:physiology*; D024343:Open Bite / Q000601:surgery / Q000628:therapy; D017289:Orthodontic Appliances, Functional; D009971:Orthodontics, Corrective; D019857:Osteogenesis, Distraction; D010347:Patient Care Planning; D063173:Retrognathia / Q000601:surgery / Q000628:therapy; D013703:Temporal Muscle / Q000503:physiopathology; D014087:Tooth Movement Techniques / Q000295:instrumentation